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(No Model.) 3 Sheets-Sheet l.

T. HYATT.

WALKING SURFACE OF ILLUMINATING GRATINGS EMPLOYED TO COVER OPENINGS T0 YAULTS AND UNDERGROUND SPACES.

No. 243,779. Patented July 5,1881.

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T. HYATT.

WALKING SURFACE OF ILLUMINATING GRATINGS EMPLOYED T0 COVER OPENINGS T0 VAULTS'A-ND UNDERGROUND SPA-OBS.

N. PETERS Pholo-Lithognpbmr. Washington. 0. c.

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, I T.- HYATT. v WALKING SURFACE OF ILLUMINATING GRATINGS EMPLOYED T0 COVER 'BPENINGS T0-VA ULT$ AND UNDBRGROUND SPAGES.-

No.243,779. PatentedJu1y5,'1881.

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UNITED STATES PATENT OFFICE.

THADDEUS HYATT, OF NEW YORK, N. Y., AssIeNoE TO ELIZABETH ADELAIDE LAKE HYATT, oE sAME PLAoE.

WALKING-SURFACE 0F lLLUMlNATlNG-GRATINGS EMPLOYED T0 COVER OPENINGS T0 VAULTS AND UNDERGROUND SPACES.

SPECIFICATION forming part of Letters. Patent No. 243,779, dated July 5, 1881. -Application filed June 6, 1881. (No model.) Patented in England August 23, 1873, June 2,1875, and November 23, 1875.

To allwhom it may concern Be it known that I, THADDEUs HYATT, of

the city, county, and State of New York,have invented certain new and useful Improvements in the Walking-Surfaces of Illuminating-Gratings Employed to (lover Openings to Vaults and Underground Spaces, of which the following is a specification.

Theobject of my invention is to make durable and safe the foot-surface of illuminatinggratings, which, in case of the glass, I accomplish by means of inlays of concrete or other material let into channels formed in the face of the glass, and by means of standing lines or of inlays made of metal or equivalent ma terial for toughness, combined with the concrete when the same is put upon plain or flat plates or into channeled or recessed gratings or plates, the standing lines being cast upon the plate in the form of ornamental or plain figures, such as circles or rings, that form curbs around the light-holes for the reception of the glasses, a like effect being also produced by means of standing lines, blocks, or mounts cast upon the plate or let into the face of the concrete between the light-holes in design shape, and in forms such as vines, leaves,fiowers, wreaths, &c., or in geometrical figures in imitation of mosaics, and the colored tiles, slips, and dots used for tessellated pavements, the metal lines determining the configuration of the concrete or body of the seeming inlays produced by this process.

My invention having been described and illustrated up to a certain stage of its development-via, as shown in Figs. 1 to 6 in my English Patents No. 2,7 88, dated August 23, 1873, No. 2,015, dated June 2, 1875, and No. 4,063, dated November 23, 1875I shall confine myself in this specification (as to the claims made herein) to the features of the invention thus made public.

In the drawings attached hereto and making part of this specification like letters of reference indicate corresponding parts in the several figures, 1 to 8.

A represents the fioor-plate or grating; B, the glasses; 0, the concrete and inlays; D,

metal inlays or standing lines at top; a a, the

light-holes b b, curbs or rims around the light.- holes.

Figure l is a plan view of a cast-iron floor-plate or grating, A, formed with reference to a filling of plastic concrete in its sunken surface. Its light-holes a a are closed by the glasses B B, set in the rims or rings 1) b, which curb the light-holes, O 0 being the concrete, put in plastic form between the rings and made flush with their tops D D. Fig. 2 is a cross-section of the same on the line av 00. Fig. 3 is a plan View of a cast-iron floor plate or grating, substantially the same as Fig. 1, but formed with reference to solid ornamental inlays, the standing metal lines being cast in the form of square rims around the light-holes, so that the sunken portions or channels between the rims are bounded by parallel lines, and thus fitted to receive inlays of geometrical shape, as shown. The corner-spaces around the circular glasses within the square curbs or rims are filled with concrete, so that the foot-surface is composed of glass, concrete, metal, and inlays. Fig. 4 is a cross-section of the same on the line y y. Fig. 5 is a plan view of a'channeled glass plate inlaid with concrete. Fig. 6 is a cross-section of the same. Figs. 7 and 8 represent an ornamental concrete surface, formed either by inlaying filigree or line metals let into the face of the concrete or by means of standing lines cast upon the floor-plate.

The invention claimed herein consists of a grating or floor-plate the surface of which is made cellular or channeled between the glasses by means of standing collars or rims, which curb the light-holes, over which glasses are fitted within the rims. The channeled portion is then filled with concrete to the level of the tops of the collars,which makes a foot-surface of concrete and metal when the glass is below, and a surface of glass, metal, and concrete when the glasses are up to, the level of the concrete and metal.

The glasses employed in gratings, as represented by Figs. 1 to 4:, are about one and a half inch diameter; but the glass plate represented by Figs.5 and 6 may be twelveinches diameter, or less or more, the squares between the channels appearinglike independent small glasses when the large plates are set in the metal gratings, the object of this part of the invention being to render the employment of large plates of glass admissible by making the surface safe to be walked upon.

I am aware that encircling rims of metal were cast upon the floor-plates represented in the drawings attached to the patent of March 7, 1871, granted to 'Wm. Dale, and that concrete was made use of to fill the sunken spaces between the rims, and that glasses were cemented within the rims over the light-holes; but the metal was not meant to become a portion of the foot-surface. My invention is the contrary of this for, instead of paring away the metal at the top of the rims to avoid showing any among the concrete, I add to the quantity, when necessary, by an additional fillet, as shown at the top of the curbs b 1) around the light-holes a a, Fig. 2.

Having thus fully described and illustrated my invention, what I claim, and desire to secure by Letters Patent, is-

1. Ooncreted illuminating-gratings set with glass, the foot-surface of which is made by combining metal with concrete or inlays, substantially as and for the purposes herein described and illustrated.

2. Goncreted and inlaid channeled glass and illuminating-gratings made with the same, substantially as and for the purposes herein described and illustrated.

THADDEUS HYATT.

Witnesses:

LEIGH RoBINsoN, W. H. RUFF. 

